Question

Water falls from a height of 50 m at the rate of 20 kg/s to operate a turbine. The losses due to frictional forces are 20% of energy incident on the turbine. The power generated by the turbine is (g = $10m{s}^{-2}$)

• A. 10 kW
• B. 12 kW
• C. 8 kW
• D. 9 kW
• E. $P_{out}=\eta \frac{W}{t}=\eta \frac{m}{t}gh$
  = $0.8\times 20\times 10\times 50$
  = $8000W$ $P_{out}=8kW$

Answer 1

Answer: (C)

Correct answer is (c) 8 kW